Github user navis commented on a diff in the pull request:
https://github.com/apache/tajo/pull/474#discussion_r27443083
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/planner/physical/ExternalSortExec.java
---
@@ -630,19 +636,43 @@ public TableStats getInputStats() {
CLOSED
}
+ private static class SimpleMerger extends PairWiseMerger {
--- End diff --
I'm thinking of rewriting current up-heap to down-heap to reduce comparing
further (50% for average AFAIK). So I've named it randomly. Till then let's
name it VectorComparePairWiseMerger.
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